ZMK Keymap Editor

The ZMK Keymap Editor offers a domain-focused platform to model multi-layer keymaps for ZMK firmware. It accepts device specifications, per-key mappings, and layer definitions to produce a coherent keymap across all layers. Conceptually, it maintains a matrix of positions per layer and ensures references between layers are valid, such as MO toggles and LT timeouts. The tool validates keycodes against the ZMK vocabulary and flags undefined or conflicting mappings before export. Users gain a single source of truth for layout intent, which reduces downstream integration errors and speeds up firmware iteration. Core value lies in early, deterministic validation and exportability to ZMK configuration formats, enabling reproducible builds. Use cases include hobbyist keyboard builds, design reviews for teams, and automation pipelines that generate per-project keymaps from a shared specification. Distinctive capabilities include cross-layer consistency checks, support for typical ZMK patterns (layer-taps, momentary layers), and straightforward exports suitable for version control. It emphasizes clarity of layer structure, axes alignment with the physical keyboard, and traceability from design to firmware. The tool helps engineers, designers, and builders converge on a solid multi-layer layout before committing to hardware changes or firmware compilation. Core features include matrix input, per-layer key assignment, default layer resolution, and export generation; advanced users may model complex behaviors and integrate with build systems. Use cases span new keyboard projects and iterative refinements of existing layouts.